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Im still mailing with support about my problems with the i3 mega. in short i have three problems and they are not really helpful.
1 temp drops to 0 when printing
2 right z axis is not responding like the left hand side is, doesn't go down or up simultaneous
3 fan makes lot of noise.

the fan the told me to get a new one they cant send it. and they send me a link to bay a new PSU for 15 US. for the Z axis problem i had to change a few connectors but that did nothing. What i found out is that the bottom plate was not mounted correctly the fan that cools the main board was under a plate and cant get air. i changed that but the problem is still there of course, the damage is done.

I think my main-board has the same problem, its from almost the same data as your printer.